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This project work summary includes receiving passives and SMA connectors, updating the budget, correcting the bill of materials, soldering and testing Board 1, conducting troubleshooting, and starting the midterm paper. Troubleshooting efforts include discovering shorts, power supply questions, and construction attempts. Transmitter and receiver testing results are discussed along with troubleshooting conclusions and future work.
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ECE 135 – The Three Presentation 8 Pat Cleary with Kevin Parker & Bryan Chavez March 24th, 2005
Work Summary • Received Passives and SMA Connectors • Updated Budget • Corrected Bill of Materials • Soldered and Tested Board 1 • Board 1 Troubleshooting • Began Midterm Paper
Initial Board 1 Troubleshooting • No Success with Tx or Rx • High-Pitched Noise and a Smoking Ferrite Bead…Good? (We’re Thinking No) • Short Discovered Between Power Supply and Ground (Not from Layout) • Power Supply Questions
Board 1 Construction – Take 2 • The Three’s Tried-and-True Strategy: Start Over • Results: Nothing Breaks During Testing!!!!!
Transmitter Testing • Left and Right Inputs to VCSEL • Signals Want to Be Eyes… Not Quite There • VCSEL Not Lasing
Receiver Testing • ROSA Output is Desirable Eye • No Output From Limiting Amplifier • Limiting Amplifier Extremely Hot at First
Troubleshooting Conclusions • Disastrous First Attempt at Board 1 • No Shorts in Current Board • Problem Could be a Design Issue or a Component Problem • Possible Theory for Receiver: Maxim Chip Overheated and is Toast?
Finish Midterm Report Continue Troubleshooting Board 1 Purchase Rabbit’s Foot Avoid Ladders and Black Cats Pray Future Work